Bottom fired package boiler



1966 R. D. WINSHIP 3,266,467

BOTTOM FIRED PACKAGE BOILER Filed Nov. 25, 1964 4, Sheets-Sheet 1 Illlllllll z' 32% mw 46 1 56 i I l I k: INVENTOR:

RALPH D. WINSHIP FIG. I BY yaw/16 ATTORNEY Aug. 16, 1966 R. D. WINSHIP3,266,467

BOTTOM FIRED PACKAGE BOILER Filed Nov. 25, 1964 4 Sheets-Sheet 2 FIG. 3

INVENTOR:

RALPH D. WINSHIP ATTORNEY Aug. 16, 1966 R. D. WINSHIP BOTTOM FIREDPACKAGE BOILER 4 Sheets-Sheet 5 Filed Nov. 25, 1964 INVENTOR:

RALPH o. WINSHIP ATTORNEY Aug. 16, 1966 R. D. WINSHIP BOTTOM FIREDPACKAGE BOILER 4 Sheets-Sheet 4 Filed Nov. 25, 1964 N QE INVENTOR:

RALPH 0. WINSHIP ATTORNEY United States Patent 3,266,467 BGTTUM FIREDPACKAGE BUILER Ralph D. Wiuship, St. Lambert, Quebec, Canada Filed Nov.25, 1964, Ser. NO. 413335 4 Claims. (Cl. ran-s The present inventionrelates to steam generators, speciiically that type of steam generatorthat is constructed in the shop and transported to the boiler site forerection, such steam generators being commonly known as package boilers.More particularly, the invention relates to means for mounting anormally vertically arranged package boiler on the bed of a flatcar orother transport means in a horizontal attitude for shipment.

In the manufacture and design of package boilers limitations are placedon the dimensions of such units by railroad clearances.- Heretofore, ithas been the practice to ship package boilers in the vertical positionwhile fixing the cross-sectional dimensions of the unit by the shippingclearances and effecting increases in furnace size and boiler heatingsurface by increasing the length of the units while holding theircross-section constant. This practice gives rise to several inherentdisadvantages. Under present conditions an increase in package boilersize must be accompanied by an increase in the amount of floor spacerequired to accommodate the unit. Therefore, in those locations wherefloor space is at a premium, the installation of a package boiler ofincreased capacity would be extremely difiicult, if not impossible.Moreover, the need to effect an increase in capacity by increasingfurnace length while maintaining the cross-sectional dimensions constantgives rise to the disadvantage of increased cost per square foot ofheating surface. Such disadvantage is realized because of the fact thatthe amount of heating surface available per tube is less for a unit ofsmaller vertical dimension. Therefore, an increase in heating surfacenecessitates added fabrication and fitting expenditures for the unitsince a greater number of tubes is required.

The present invention contemplates means for offsetting the aforesaidundesirable characteristics in package boilers in addition toaccomplishing other manifest advantages. The invention permits packageboiler units to be mounted in a horizontal attitude during shipment in amanner that maintains boiler dimensions within tolerable railroadclearances. This permits the design of package boilers having capacitiesgreater than heretoforedesigned units. The unit is transported to theboiler site in the horizontal position and then is rotated into itserected vertical position by means of lifting cranes.

The instant inventive concept involves provision of a cradle beamstructure capable of supporting a package boiler in a horizontalposition during shipment in a manner that prevents the undue stressingof the boilers pressure parts. Because of the enablement of the shipmentof package boilers in such a way many of the disadvantages heretoforecharacteristic of package boilers are eliminated. For example, the useof steam drums having greater diameters and therefore units having muchgreater steaming capacities are permitted. Also, increases in boilercapacities can be effected without an increase in the amount of floorspace required for the units. Still further, heating surface increasesin boilers in order to obtain greater steam capacity can be effectedwithout increasing the number of tubes employed, thereby reducing thecost of the units per pound of steam generated.

Another manifest advantage of the instant invention is derived from thefact that package boilers can now be constructed with a gas flow passagethat establishes communication between the boiler bank and the furnacechamber throughout the entire width of the unit. Due

Patented August 16, 1956 to such a gas flow passage the temperature ofthe gases that impinge upon the steam drum are substantially the samethroughout the length of the drum thereby eliminating the thermalgradient that existed along the axis of steam drums employed in thepackage boilers of the prior art wherein, due to shipment restrictions,the gas flow pass was caused to communicate with the furnace chamber atone side thereof whereby the flow of gases through the boiler bankoccurred along the axis of the drum. This flow of gases along the axisof the drum with its attendant change in gas temperature resulted in agreater amount of steam generation at one end of the drum than at theother thus giving rise to a non-uniform Water level in the drum. In thepresent unit the gas flow being transverse to the drum axis effectselimination of the attendant disadvantage of a non-uniform water levelwithin the drum thereby facilitating the control of drum water level andalso removing the restriction placed upon the installation of druminternals therewithin.

It is therefore an object of the instant invention to provide means formounting a package boiler for shipment in a manner that permits thedesign of units having increased vertical dimensions yet that enablesunits having such dimensions to be capable of shipment in light ofestablished clearance restrictions.

Another object of the invention is to provide means that effect themounting of a package boiler unit in a horizontal position duringshipment in a manner that prevents the undue stressing of the boilerspressure parts.

Still another object is to provide means for mounting a package boilerin a horizontal position during shipment and for erecting such unit atthe boiler site by rotating it from its horizontal attitude to avertical, installed attitude in a manner that prevents undue stressingof the pressure parts and connections.

Other objects and advantages will appear from the fo lowing descriptionof one embodiment of the invention, and the novel features will beparticularly pointed out hereinafter in connection with the appendedclaims.

The invention is described with reference to the accompanying drawingswherein:

FIGURE 1 is a sectional side elevation of an installed package boiler ofthe type contemplated by the present invention;

FIGURES 2 and 3 are side and end elevations of a package boiler mountedon a flatcar bed in accordance with the present invention;

'FIGURE 4 is .a partial sectional side elevation of a package boilerhorizontally mounted upon the cradle beam assembly of the presentinvention;

FIGURES 5 and 6 are partial end views of the cradle beam assembly of thepresent invention; and

FIGURE 7 is a partial section taken along line 77 of FIGURE 4.

Referring now to the drawings, FIGURE 1 discloses a package boiler 10 ofthe type contemplated by the present invention in its installed orerected position. The boiler 10 is of the two-drum type and comprises afurnace section 12, a boiler bank or convection heating section 14 and asuperheater 16. The uni-t is bounded by rectangularly disposed wallsincluding side walls 18 formed of tubes extending between upper andlower headers 20 and 22, each of which communicates with the upper andlower drum, respectively, by means of appropriate connections. The frontwall 28 is formed of tubes emanating from a transverse lower header 30and extending vertically into tubes forming the roof 32, the latterbeing directly connected to the upper drum 2-4. The rear wall of theunit, indicated as 34, comprises the rearwardmost row of boiler banktubes which are connected at each end to the upper drum 24 and lowerdrum 26. As shown, these tubes are substantially C-shaped and projectrearwardly beyond the rearwardmost surface of the two drums. The tubesforming the Walls of the boiler can be either plain, tangent-spacedtubes, finned tubes, or of the common welded wall construction. Theremainder of the boiler bank section 14 comprises parallel rows ofvertically extending subtantially C-shaped tubes connecting the upperdrum 24 with the lower drum 26. During operation of the boiler some ofthese tubes receive a greater amount of heat from the combustion gasesgenerated in the furnace and therefore serve as risers conducting steamand water mixture to the upper drum 24. The others, which receive lessheat, serve as downcomers conducting separated flu id and feedwater tothe lower drum 26. Refractory baffles 36, two of which are shown in thedisclosed arrangment, are positioned at spaced levels within the boilerbank being connected to selected tubes at those levels and so disposedto direct gases flowing through the boiler bank along a substantiallysinuous path to effect more efficient heat transfer between the gasesand the fluid flowing through the tubes.

One row of steam generating tubes forms a tubular partition 33separating the furnace .section 12 from the boiler bank 14. These tubesextend between the upper and lower drums v24 and 26 and, as shown inFIGURE 1, present a gas impervious structure in the lower portionthereof by means of welded, gas impervious fins 40 which unite adjacenttubes and which serve to connect the endmost tubes of the partition tothe side Walls 18. The tubes in the upper portion of the partition 38are not finned, but are spacedly offset as shown to provide openings 42permitting gases generated in the furnace 12 to flow to the boiler bank14. A superheater 16 formed of sinuously-shaped tubes may be positionedadjacent the openings 42.

The disclosed package boiler has burner means 44 surrounded by a windbox46 and located in the furnace floor. The burners 44 are so disposed asto effect firing in a vertical direction whereby the combustion gasesare caused to flow upwardly through the furnace section 12, thencethrough the superheater 16 and into the the convection section or boilerbank 14 where they are directed downwardly and exit the unit through anopening 48 provided at the bottom of the rear wall. From here the gasescan flow to an air heater or other ancillary equipment (not shown)before passing out a stack. Completing the boiler structure are spacedbuckstays 50 attached to the walls 18, 28, and 34. They surround theunit structure being welded to the wall-forming tubes and serve tostrengthen or rigidify these walls for the purpose of enabling the wallsto withstand minor furnace explosions or the like. Insulating material52 is attached to the boiler walls by any suitable means and covers theexterior of the unit. Covering the insulating material is an outercasing 54 formed of thin sheet metal.

When erected, the described package boiler sits on footings 56 and 58which can be formed of concrete or other like material and which supportthe unit vertically at four corners of its base. As shown, saddles 60sup port the ends of the lower side wall headers 22 upon the frontfootings 56. The rear drum saddles 62 which are attached to the lowerdrum 26 are positioned upon the rear footings 58. In this manner theunit is bottom supported and adapted for vertical thermal expansion.

The operation of the disclosed unit is substantially conventional.Feedwater is admitted to the upper drum 24 where it mixes with waterseparated from the steam-water mixture by processing equipment (notshown) in the upper drum. The water circulates downwardly through thetubes serving as downcomers in the boiler bank to the lower drum 26.From here it is supplied to the tubes forming the walls of the furnacesection 12 and those which are the risers within the boiler bank 14.Fuel is fed to the burners 44 which generate combustion gases within thefurnace 12. These gases flow in an upwardly direction through thefurnace section and thence through the superheater 16 and into theboiler bank section 14. By means of the heat transfer relation betweenthe gases and the fluid flowing through the tubes a steam and watermixture is created and natural circulation of the fluid is induced.

As stated above, it has always been the practice to transport packageboilers in an erect or upright position upon the bed of a flatcar orother transport means in shipping them from the manufacturing site tothe boiler site. Because of limitations imposed by railroad clearancesthe height of the units transported cannot exceed approximately 16 feet.This requires, therefore, that the vertical dimension of the boiler bemaintained at a value somewhat less than 16 feet, and thecross-sectional dimensions of the units be maintained substantiallyconstant. Because of this practice, the added heating surface necessaryto obtain greater steam generating capacity must be added to thelongitudinal dimension of the boiler, thereby requiring more floor spaceto accommodate these units of greater capacity. Moreover, the maximumcapacity of I such units is limited by the amount of gas weight that canbe accommodated through the gas passing sections of the unit without theestablishment of excessively high gas velocity. Because thecross-sectional dimensions of package boilers are fixed, the dimensionsof the boiler bank are also fixed, and the amount of heating surface canbe increased only by increasing the length of the gas pass containingthis .heating surface. If an excess of tubes is positioned within thegas pass the gas velocity would become too great for effective heattransfer, thereby lessening the efliciency of the units. The steamcapacities of these package boilers therefore is limited to thatcapacity which can be generated by means of the limited amount ofheating surface capable of being positioned within the gas pass orboiler bank.

In accordance with the present invention, means are provided that permita package boiler to be horizontally mounted upon the bed of a transportmeans such as a fiatcar or the like during transport to the boiler site.By transporting the unit in this manner many of the above mentioneddisadvantages heretofore characteristic of package boilers are overcomeand several other manifest advantages are derived.

As shown in FIGURES 2 and 3 the fully constructed package boiler 10 islaid horizontally with its rear wall 34 lowermost upon the bed 63 of aflatcar. Supporting the boiler is a cradle beam assembly 64 thatcomprises a number of rectangularly disposed structural members arrangedto receive the gravitational loading or weight of the boiler in a mannerthat prevents overstressing of the boilers component pressure parts. Thecradle beam assembly 64 comprises a pair of oppositely spaced I- beams,designated the longitudinal members 66, that extend along the boilerrear wall 34 between the lower drum 26 on the left and the upper drum 24on the right. A pair of channels, designated the lateral members 68 and70, are positioned substantially beneath the lower and upper drum-srespectively and extend beyond the boiler side walls connecting to thelongitudinal members 66. The ends of the left lateral member 68 areshaped by removal of a portion of the flanges and web thereof asindicated at 72 such that they are snugly received within the flanges ofthe longitudinal members 66 at a position somewhat inwardly of the endsthereof. A weld is applied along the flanges and web of the longitudinalmembers 66 to complete the connection. Unlike the left lateral member 68the right lateral member 70 is arranged in webabutting relation with theright-hand ends of the longitudinal members 6-6. A weld is applied torigidly connect the members. A lateral stiffening beam 74 extendsbetween the left ends of the members 66 and is attached thereto by meansof welds connecting the flanges of the members. This member is intendedto provide additional support at the lower end of the boiler when theunit is being rotated through its erect position to be described.

hereinafter. Additional stiffening at this end is provided by aplurality of gussets 76 which extend between and are connected to thewebs and flanges of the lateral stiffening beam 74 and the left lateralmember 68. As shown the lower edge 78 of the gussets 76 is diagonallycut so as to facilitate rotation of the unit into its vertical position.A lateral stiffening channel 77 is welded to and extends along thelength of channel 70 to stiffen the structure at this end. Gussets 79further stiffen the structure in this area. Bearing pads 80 are attachedto the upper flange of left lateral member 68 and positioned to receivethe bearing surface of the drum saddles 62 that mount the lower drum 26.Lifting plates 82 and 84 are weldedly united to the ends of longitudinalmembers 66 at the four corners of the cradle beam assembly. The plates82 and 84 are apertured at 86 to receive the lifting hooks of a crane(not shown) for the purpose of first, lifting the package boiler andcradle beam assembly onto the flatcar bed 63 and secondly, in the caseof the apertures in plates 84, for rotating the unit into erectedposition at the boiler site. Apertured angle members 88 are attached tothe inside flange of the lateral stiffening beam 74 and serve to attachthe drum saddles 62 to the cradle beam assembly by means of a breakableconnection such as threaded bolts or the like. The connection betweenthe boiler and cradle beam assembly at the other end is effected bymeans of angle members 90 or the like having one leg welded to the drumat spaced points and the other leg apertured in alignment with similarapertures in the right lateral member '70. Bolts received within theapertures serve to attach the angle member to the lateral member 70.

A header tie arrangement may be employed to support the hollowed sidewall headers 22 during erection of the boiler. It consists of astructural beam 92 attached to the lower side wall headers 22 andarranged to receive one end of tie rods 94 and bosses 96 attached to theupper flange of longitudinal members 66 at substantially theirmid-point. The bosses 96 are recessed to receive the ends of tie rods94.

Means are provided within the boiler itself for supporting the pressureparts and for transferring the loading of these pressure parts to thecradle beam assembly. These means include a beam 98 which extendssubstantially the full width of the boiler and is installed between thetubes forming the boiler rear wall 34 and the next adjacent row ofboiler bank tubes. The ends of this beam are attached to the boiler sidewalls by means of plates :100 that are scalloped so as to fit betweenadjacent side wall tubes. The plates 100' are welded to the beam 98 andto the side wall tubes and remain a permanent part of the boiler. Spacermembers 102 extend the width of the boiler and are positioned betweenadjacent rows of boiler bank tubes in alignment with the support beam 98. The purpose of these spacers is to prevent vibration of the boilerbank tubes while the unit is 'lying in its horizontal position duringtransit in order to prevent vibration of the tubes which might tend todamage or destroy the refractory baffles 36. These spacers 102 areconveniently formed of wood which can be destroyed when the boiler isfirst operated by the combustion gases which flow through the boilerbank and effect ignition of the spacers.

As shown in FIGURE 4 a loading of the rear wall 34 is transferred to thecradle beam assembly by means of the rear wall buckstays 50 which extendbeyond the boiler side walls 18 so as to engage the lower flange of thelongitudinal members 66. Due to the fact that those buckstays adjacentthe boiler bank support beam 98 will undergo a greater amount ofcompressive stress, it may be necessary to strengthen the buckst-ays andsuch is conveniently effected by attaching a short length of an Ibeam 4to the buckstay upper flange as by means of welding.

The operation of the arrangement is as follows. The cradle beam assemblyis mounted to the constructed package boiler which normally stands in avertical or erected position. The mounting is effected by connectionsbetween the angles 88 mounted to the lateral stiffening beam 74 and thedrum saddles 62 at the lower end of the boiler and by similarconnections between the upper angle member drum and the apertures in theright lateral member 70'. After these connections have been made, cranehooks are attached to the apertures in the right lifting plates 84 andthe unit is rotated to its horizontal position. Another set of cranehooks engages the apertures in the left lifting plates 82 and the entireassembly is lifted onto the bed 63 of the flatcar to be used totransport the boiler.

With the boiler mounted on the flatcar in this manner its weight, ratherthan being supported by the tubes forming the rear wall 34, istransferred to the cradle beam assembly, first, because of the rigidconnection between the cradle beam and the boiler drums 24 and 26 andsecondly, due to the transfer of loading from the rear wall to thelongitudinal members 65 effected by means of the rear wall buckstays 50.Moreover, because the spacers 102 prevent vibration of the boiler banktubes during transit the refractory baffles 36 mounted in the boilerbank 14- are prevented from being damaged.

When it is desired to erect the boiler at its site, lifting hooks againengage the lifting plates 82 and 84 and the threaded connection existingbetween the upper drum angles 88 and the right-hand lateral member 68 isbroken, but the bolts are permitted to remain in the apertures. Thispermits relative motion along a line parallel to the surface of the rearwall between the upper drum 24 and the cradle beam assembly 64.Thereafter, the crane engaging the right lifting plates 84 raises thatend causing the boiler to pivot about a point adjacent the lower drum26. When this occurs the loading of the boiler will tend to shift fromthe longitudinal members and other components of the cradle beamassembly 6 4 to the drum saddles 62 and side wall headers 22 which aremounted upon footings 56 and 58. Because the connection between theupper drum and the cradle beam assembly is now loose, the boilerpressure parts are permitted to take a natural set thereby alleviatingany undue tensile stressing of the pressure parts or of theirconnections.

While the instant invention has been disclosed with reference to aparticular embodiment thereof, it is to be appreciated that theinvention is not to be taken as limited to all of the specific detailsthereof as modifications and variations thereof can be made withoutdeparting from the spirit or scope of the invention.

What is claimed is:

1. In combination with a normally vertically arranged tubulous packageboiler assembly having opposed front, rear and side walls and a roofdefining an enclosed furnace chamber, a boiler bank opening into saidfurnace chamber including substantially parallel-1y disposed upper andlower drums located at the rear of said boiler assembly and disposedlaterally of said side walls, a bank of parallelly disposed tubesarranged in aligned rows connecting said drums, the rearwardmost rowthereof defining the rear wall of the boiler assembly and refractorybaifie means extending the width of said boiler bank and intersecting aplurality of said boiler bank tubes, the improvement which comprisesmeans for mounting said package boiler assembly in a horizontal attitudeupon transport means during shipment thereof including a cradle beamassembly adapted to rest on the bed of said transport means comprisingrectangularly arranged support beams connected at their corners and ofsufficient height that, when connected to said boiler assembly, willmaintain the rear wall thereof above said bed; detachable meansconnecting said cradle beam assembly to said drums adjacent to theopposed ends thereof, the connection thereof being capable oftransferring the vertical loading of said drums to said cradle beamassembly; vertically aligned spacer members extending substantially thewidth of said boiler bank interpositioned between adjacent rows of tubesand means for transferring the vertical loading of said spacer membersto said cradle beam assembly.

2. In combination with a normally vertically arranged tubulous packageboiler assembly having opposed front, rear and side walls and a roofdefining an enclosed furnace chamber, a boiler bank opening into saidfurnace chamber including substantially parallelly disposed upper andlower drums located at the rear of said boiler assembly and disposedlaterally of said side walls, a bank of parallelly disposed tubesarranged in aligned rows connecting said drums, the rearwardmost rowthereof defining the rear wall of the boiler assembly and refractorybafile means extending the width of said boiler bank and intersecting aplurality of said boiler bank tubes, the improvement which comprisesmeans for mounting said package boiler assembly in a horizontal attitudeupon transport means during shipment thereof including a cradle beamassembly adapted to rest on the bed of said transport means comprisingrectangularly arranged support beams connected at their corners and ofsufficient height that, when connected to said boiler assembly, willmaintain the rear wall thereof above said bed; detachable meansconnecting said cradle beam assembly to said drums adjacent to theopposed ends thereof, the connection thereof being capable oftransferring the vertical loading of said drums to said cradle beamassembly; the connection between the upper drum and said cradle beamassembly being capable of effecting relative sliding movementtherebetween along a line parallel to said boiler assembly rear wall;vertically aligned spacer members extending substantially the width ofsaid boiler bank interpositioned between adjacent rows of tubes andmeans for transferring the vertical loading of said spacer members tosaid cradle beam assembly.

3. In combination with a normally vertically arranged tubulous packageboiler assembly having opposed front, rear and side 'walls and a roofdefining an enclosed furnace chamber, a boiler bank opening into saidfurnace chamber including substantially parallelly disposed upper andlower drums located at the rear of said boiler assembly and disposedlaterally of said side walls, a bank of parallelly disposed tubesarranged in aligned rows connecting said drums, the rearwardmost rowthereof defining the rear wall of the boiler assembly, and refractorybafile means extending the width of said boiler bank and intersecting aplurality of said boiler bank tubes, buckstay means surrounding andbeing weldedly attached to the walls of said boiler assembly, theimprovement which comprises means for mounting said package boilerassembly in a horizontal attitude upon transport means during shipmentthereof including a cradle beam assembly adapted to rest on the bed ofsaid transport means comprising rectangularly arranged support beamsconnected at their corners and of sufficient height that, when connectedto said boiler assembly, will maintain the rear wall thereof above saidbed, detachable means connecting said cradle beam assembly to said drumsadjacent the opposed ends thereof, the connection thereof being capableof transferring the vertical loading of said drums to said cradle beamassembly, vertically aligned spacer members extending substantially thewidth of said boiler bank interpositioned between adjacent rows oftubes, and means for transferring the vertical loading of said spacermembers to said cradle beam assembly including lateral extensions ofsaid buckstay beams attached to the boiler assembly rear wall withopposed ends thereof in abutting engagement with said cradle beamassembly.

4. In combination with a normally vertically arranged tubulous packageboiler assembly having opposed front, rear and side walls and a roofdefining an enclosed furnace chamber, a boiler bank opening into saidfurnace chamber including substantially parallelly disposed upper andlower drums located at the rear of said boiler assembly and disposedlaterally of said side walls, a bank of parallelly disposed tubesarranged in aligned rows connecting said drums, the rearwardmost rowthereof defining the rear wall of the boiler assembly, and refractorybaflle means extending the width of said boiler bank and intersecting aplurality of said boiler bank tubes, buckstay means surrounding andbeing weldedly attached to the walls of said boiler assembly, theimprovement which comprises means for mounting said package boilerassembly in a horizontal attitude upon transport means during shipmentthereof including a cradle beam assembly adapted to rest on the bed ofsaid transport means comprising rectangnilarly arranged support beamsconnected .at their corners and of sufficient height that, whenconnected to said boiler assembly, will maintain the rear wall thereofabove said bed, detachable means connecting said cradle beam assembly tosaid drums adjacent the opposed ends thereof, the connection thereofbeing capable of transferring the vertical loading of said drums to saidcradle beam assembly, and the connection between the upper drum and saidcradle beam assembly being capable of effecting relative slidingmovement along a line parallel to said boiler assembly rear Wall,vertically aligned spacer members extending substantially the width ofsaid boiler bank interpositioned between adjacent rows of tubes, andmeans for transferring the vertical loading of said spacer members tosaid cradle beam assembly including lateral extensions of said buckstaybeams attached to the boiler assembly rear wall with opposed endsthereof in abutting engagement with said cradle beam assembly.

References Cited by the Examiner UNITED STATES PATENTS KENNETH W.SPRAGUE, Primary Examiner.

1. IN COMBINATION WITH A NORMALLY VERTICALLY ARRANGED TUBULOUS PACKAGE BOILER ASSEMBLY HAVING OPPOSED FRONT, REAR AND SIDE WALLS AND A ROOF DEFINING AN ENCLOSED FURNACE CHAMBER, A BOILER BANK OPENING INTO SAID FURNACE CHAMBER INCLUDING SUBSTANTIALLY PARALLELLY DISPOSED UPPER AND LOWER DRUMS LOCATED AT THE REAR OF SAID BOILER ASSEMBLY AND DISPOSED LATERALLY OF SAID SIDE WALLS, A BANK OF PARALLELLY DISPOSED TUBES ARRANGED IN ALIGNED ROWS CONNECTING SAID DRUMS, THE REARWARDMOST ROW THEREOF DEFINING THE REAR WALL OF THE BOILER ASSEMBLY AND REFRACTORY BAFFLE MEANS EXTENDING THE WIDTH OF SAID BOILER BANK AND INTERSECTING A PLURALITY OF SAID BOILER BANK TUBES, THE IMPROVEMENT WHICH COMPRISES MEANS FOR MOUNTING SAID PACKAGE BOILER ASSEMBLY IN A HORIZONTAL ATTITUDE UPON TRANSPORT MEANS DURING SHIPMENT THEREOF INCLUDING A CRADLE BEAM ASSEMBLY ADAPTED TO REST ON THE BED OF SAID TRANSPORT MEANS COMPRISING RECTANGULARLY ARRANGED SUPPORT 